Lighting Fixture with Adjustable Light Pattern and Extendable House Structure

ABSTRACT

A lighting fixture includes a reflector reflecting light from a fluorescent lamp to a desired direction, and one or more lamp connectors connecting the reflector to rotatably and detachably coupling with the fluorescent lamp, wherein the reflector is adapted to selectively rotate with respect to an axis of the fluorescent lamp for reflecting light from the fluorescent lamp so as to change a light pattern of the fluorescent lamp towards an opening of the foldable housing. The foldable housing includes two side frames and a retention frame extended between the two side frames to retain a distance therebetween, wherein the side frames are pivotally coupled with the retention frame to fold between an unfolded position to retain the fluorescent lamp in longitudinal position and a folded position to form a compact size for storage and transportation.

CROSS REFERENCE OF RELATED APPLICATION

This is a CIP application that claims the benefit of priority under 35U.S.C. §119 to a non-provisional application, application Ser. No.13/373,506, filed Nov. 14, 2011, which is a divisional application of anon-provisional application, application Ser. No. 12/387,698, filed May5, 2009, which is a non-provisional application of a provisionalapplication, having an application No. 61/209,054 and a filing date ofMar. 3, 2009.

BACKGROUND OF THE PRESENT INVENTION

1. Field of Invention

The present invention relates to a lighting luminaire and moreparticularly to a lighting fixture with a rotatable reflector to adjustthe light pattern and a foldable house structure adapted to be unfoldedto form a compact size for storage and transportation.

2. Description of Related Arts

The fluorescent luminaries are commonly used in a lot of area.Typically, they are suspended or fixed on the ceiling. FIG. 12 shows theprior art of a typical fluorescent lamp luminaire. The reflector 5 isfixed on a reflector support 7. The reflector support 7 is fixed on ahousing 8. The reflector 5 can not be adjusted after installed on thehousing 8. Therefore, the light pattern is fixed by the manufactory. TheU.S. Pat. No. D520,173S disclosed a fluorescent luminaire with fixedlight pattern. In a lot of applications, it is preferred to adjust thelight pattern to high light the desired subject. Therefore the typicalfluorescent lamp luminaire is not suitable for this kind ofapplications.

U.S. Pat. No. 6,206,548 B1 disclosed a light fixture with rotatablemirror which is mounted to the housing. It has limited light patternadjustment and it is not very efficient.

U.S. Pat. No. 5,550,725 disclosed a light fixture with a rotatablereflector. The reflector rotates along with the lamp axis. The directionof the light can be adjusted. However, the width of the light beam cannot be adjusted. The system is also very complex, and costly tofabricate.

U.S. Pat. No. 6,450,668 B1 disclosed a light fixture with a foldablestructure. It can only change the light direction. It cannot change thelight pattern. The folding structure did not save much space. It isstill very bulky to handle.

Some of the light fixture has the capability to adjust the light patternor the direction of the light by rotating the lamp with or without thereflector or moving the lamp with the reflector. They are also veryinconvenient to use.

SUMMARY OF THE PRESENT INVENTION

The main object of the present invention is to provide a lightingfixture with an adjustable light pattern and a foldable house structure,which is an improved luminaire with adjustable light direction whichutilize the fluorescent lamp and the rotatable reflector.

Another object of the present invention is to provide a lighting fixturewith an adjustable light pattern and a foldable house structure, whereinthe rotatable reflector is adapted for incorporating with a conventionallight housing to selectively adjust the light pattern of the fluorescentlamp in the conventional light housing.

Another object of the present invention is to provide a lighting fixturewith adjustable light beam to change the light pattern.

Another object of the present invention is to provide a lighting fixturewith a foldable house structure, wherein the housing is adapted forbeing unfolded to retain the fluorescent lamps in position and isadapted for being folded into a compact size for storage andtransportation.

Accordingly, in order to accomplish the above objects, the presentinvention provides a lighting fixture for fluorescent lamp, comprising:

a housing;

at least a fluorescent lamp longitudinally and operatively supported atthe housing;

one or more lamp connectors rotatably and detachably mounting along thefluorescent lamp; and

a reflector coupling with the lamp connectors, wherein the reflector isadapted to selectively rotate with respect to an axis of the fluorescentlamp for reflecting light from the fluorescent lamp so as to change alight pattern of the fluorescent lamp towards an opening of the housing.

The housing of the lighting fixture is embodied as a foldable housingwhich comprises two side frames and a retention frame extended betweenthe two side frames to retain a distance between the side frames,wherein the side frames are pivotally coupled with the retention frameto fold between an unfolded position and a folded position. Accordingly,the fluorescent lamps are longitudinally and operatively supported atthe foldable housing when the foldable housing is folded at the unfoldedposition.

These and other objectives, features, and advantages of the presentinvention will become apparent from the following detailed description,the accompanying drawings, and the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a sectional view of a lighting fixture with an adjustable thelight pattern according to a preferred embodiment of the presentinvention.

FIG. 2 is a sectional view of the lamp connector and its alternativemodes according to the above preferred embodiment of the presentinvention.

FIG. 3 is a sectional view illustrating the lamp connector and itsalternative modes mounting to the fluorescent lamp according to theabove preferred embodiment of the present invention.

FIG. 4 illustrates the applications of the rotatable reflector for thelighting fixture according to the above preferred embodiment of thepresent invention.

FIG. 5 is a perspective view of the lighting fixture according to theabove preferred embodiment of the present invention.

FIG. 6 is a perspective view of the lamp connector according to theabove preferred embodiment of the present invention.

FIG. 7 is a top view of the lighting fixture according to the abovepreferred embodiment of the present invention, illustrating the foldablehouse structure of the light fixture.

FIG. 8 is a sectional view of the lighting fixture with the foldablehouse structure according to the above preferred embodiment of thepresent invention.

FIG. 9 is a top view of the foldable house structure of the lightingfixture according to the above preferred embodiment of the presentinvention.

FIG. 10 is a partially perspective view of the foldable housingstructure of the lighting fixture according to the above preferredembodiment of the present invention.

FIG. 11 is a top view of the foldable housing structure of the lightingfixture according to the above preferred embodiment of the presentinvention, illustrating the foldable housing structure being folded at afolded position.

FIG. 12 illustrates a conventional reflector for the lighting fixtureaccording to the above preferred embodiment of the present invention.

FIG. 13 is a sectional view of the lighting fixture with the extendablehouse structure according to a second preferred embodiment of thepresent invention.

FIG. 14 is a top view of the extendable house structure of the lightingfixture according to the above second preferred embodiment of thepresent invention.

FIG. 15 is a partially perspective view of the extendable housingstructure of the lighting fixture according to the above secondpreferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIGS. 1 to 5 of the drawings, a lighting fixture accordingto a preferred embodiment of the present invention is illustrated,wherein the lighting fixture comprises a housing 10, one or morefluorescent lamps 20, one or more lamp holders 30, one or morereflectors 40, and one or more lamp connectors 50.

The housing 10 receives all the elements for holding and protection. Thelamp holder 30 is connected on the housing 10 and holds the fluorescentlamp 20 for supporting and providing power. In a housing 10 there couldbe one or more fluorescent lamps 20 supported by the correspondingholders. Preferably, these fluorescent lamps 20 are longitudinallysupported and are aligned in parallel in the housing 10.

The reflector 40 is longitudinally extended along the fluorescent lamp20 with the corresponding length as the fluorescent lamp 20. However,the reflector 40 can have a designed length extended along thefluorescent lamp 20 for light reflection. The reflector 40 has a concaveshaped cross section, preferably a U-shaped cross section. The innersurface of the reflector 40 can reflect light. Therefore, the reflector40 can cover the fluorescent lamp 20 and reflect the light to a focuseddirection. In a preferred embodiment, the reflector 40 comprises a backreflecting panel 41 and two slanted reflecting panels 42 inclinedlyextended from the edge of the back reflecting panel 41 to make the crosssection of the reflector 40 a concave shape. So when the reflector isover the fluorescent lamp 20, the back reflecting panel 41 and theslanted reflecting panels 42 can reflect the light of the lamp to changethe light pattern and light direction towards a selected direction.

Referring to FIGS. 2, 3 and 6, the lamp connector 50 is made of flexiblematerial. It comprises an open end 51 and a supporting end 52. Behindthe open end 51, the lamp connector 50 comprises a receiving cavity 53which has a C-shaped cross section and a similar size as the fluorescentlamp 20. The opening of the open end 51 is a little smaller than thediameter of the fluorescent lamp 20. The open end 51 also has twoslanted opening edges 511 outwardly and opposedly extended thereat. Thetwo slanted opening edges 511 provide a larger opening to receive thefluorescent lamp 20. The fluorescent lamp 20 can be inserted into thereceiving cavity 53 from the open end 51 thereof, and be detachablyconnected by the lamp connector 50 by elastic force. In this way, thelamp connector 50 is pivotally attached on the fluorescent lamp 20, andcan be rotated along the axis of the fluorescent lamp 20. According tothe preferred embodiment, each of the lamp connectors 50 can be a lampclip for detachably clipping on the fluorescent lamp 20.

The supporting end 52 of the lamp connector 50 is affixed to an innersurface of the reflector 40. According to the preferred embodiment, thesupporting end 52 of the lamp connector 50 is affixed onto the innersurface of back reflecting panel 41 of the reflector 40 to support thereflector 40. It is appreciated that the supporting end 52 of the lampconnector 50 can be affixed to any of the reflecting panels 41, 42 todetachably couple the reflector 40 along the fluorescent lamp 20.Therefore the reflector 40 and the fluorescent lamp 20 are pivotallyconnected by the lamp connector 50. In the way, the reflector 40 can berotated along the axis of the fluorescent lamp 20 to adjust thereflection of the light to a desired direction. Each reflector 40 mayhave one or more lamp connectors 50 to connect with the fluorescent lamp20. Preferably, a reflector 40 has two lamp connectors 50 affixed at thetwo ends thereof. The lamp connectors 50 can be affixed onto thereflector 40 by screw, glue, or any other similar methods.

Referring to FIGS. 2 and 3, the supporting end 52 of the lamp connectors50 has different heights. Therefore the fluorescent lamp 20 can beinstalled in the reflector 40 with different positions. This gives aflexibility to apply the present invention to be adjusted so as to havedifferent light beam angles. In other words, the lamp connectors 50 areadapted to selectively configure a length between the open end 51 andthe supporting end 52 in such a manner that when the fluorescent lamp 20is coupled at the open end 51 of the lamp connector 50, a distancebetween the fluorescent lamp 20 and the reflector 40 is selectivelyadjusted corresponding to the length of the lamp connector 50.

Referring to FIGS. 4 and 5, in practice, the reflector 40 can be rotatedover the fluorescent lamp 20 along the axis thereof to adjust thereflection direction. Therefore even the housing 10 and the fluorescentlamp 20 are affixed, the lighting direction can still be adjusted aswill. If there are multiple lamps 20 in a housing 10, each reflector 40of each fluorescent lamp 20 can be adjusted individually and providesmore flexibility.

The present invention is very convenient to install and use. It isappreciated that the reflectors 40 can be detached from the fluorescentlamps 20 to be packed without the fluorescent lamps 20.

FIGS. 7 to 11 illustrate an alternative mode of the housing 10′ as afoldable housing which is adapted to be folded between an unfoldedposition and a folded position. As shown in FIGS. 7 to 11, the housing10′ comprises two side frames 11′ and a retention frame 12′ extendedbetween the side frames 11′ to retain a distance between the side frames11′. Accordingly, the distance between the side frames 11′ should beretained to correspondingly match with the length of the fluorescentlamp 20.

The lamp holders 30 are spacedly provided along the inner sides of theside frames 11′ in such a manner that two ends of each of thefluorescent lamp 20 are electrically coupled at two corresponding lampholder 30 at the side frames 11′ respectively when the housing 10′ isfolded at the unfolded position. Accordingly, the lamp holders 30 are aplurality of lamp sockets spacedly formed at the side frame 11′ toelectrically couple with the ends of the fluorescent lamps 20.

Each of the side frames 11′ comprises two folding arms 111′ pivotallycoupling with the retention frame 12′, wherein the folding arms 111′ ofeach of the side frames 11′ are pivotally folded between the unfoldedposition and folded position. As shown in FIGS. 7 and 9, at the unfoldedposition of each of the side frames 11′, the two corresponding foldingarms 111′ are pivotally folded end-to-end to form an elongatedstructure. As shown in FIG. 11, at the folded position of each of theside frames 11′, the two corresponding folding arms 111′ are pivotallyfolded to overlap with the retention frame 12′ such that the two foldingarms 111′ are parallel with each other. Preferably, the two folding arms111′ of each of the side frame 11′ have the same length such that eachof the side frames 11′ can be pivotally folded in half to the retentionframe 12′ when the side frame 11′ is pivotally folded at its foldedposition.

As shown in FIG. 10, the retention frame 12′, preferably having an Omega“a” shaped cross section, defines an upper mid-portion 121′ and twolower side-portions 122′. It is appreciated that the retention frame 12′can have a hollow rectangular cross section or a U-shaped cross section.The folding arms 111′ of the side frames 11′ are pivotally coupled atthe top side of the mid-portion 121′ of the retention frame 12′ suchthat when each of the folding arms 111′ is pivotally folded towards theretention frame 12′, the folding arm 111′ is folded to align with therespective side-portion 122′ of the retention frame 12′. Therefore, thelamp holders 30 are enclosed and protected within the two correspondingfolding arms 111′ of the side frame 11′ when the folding arms 111′ arefolded at the folded position.

It is worth to mention that when the housing 10′ is pivotally folded atits unfolded position, the fluorescent lamps 20 are spacedly mountedbetween the side frames 11′ to electrically couple with the lamp holders30, wherein the reflectors 40 are detachably coupled with thefluorescent lamps 20 via the lamp connectors 50 at a position that eachof the reflectors 40 is adapted to selectively rotate with respect to anaxis of the respective fluorescent lamp 20 for reflecting light from thefluorescent lamp 20 so as to change a light pattern and/or a lightdirection of the fluorescent lamp 20 towards an opening of the housing10′. In addition, the reflector 40 can be coupled with the fluorescentlamp 20 via the lamp connector 50 or can be directly coupled to the sideframe 11′ at a position between the folding arms 111′ of the two sideframes 11′. In other words, the housing 10′ can also be incorporatedwith the conventional reflector 5.

When the reflectors 40 and the fluorescent lamps 20 are detached fromthe housing 10′, the housing 10′ is adapted to pivotally fold to itsfolded position to form a compact structure, such that the reflectors40, the fluorescent lamps 20, the lamp connectors 50, and the foldedhousing 10′ can be packed in a compact package for transportationpurpose.

FIGS. 13 to 15 illustrate another alternative mode of the housing 10A asan extendable housing which is adapted to detachably couple with anotherhousing 10A to form an expandable light frame. As shown in FIGS. 13 to15, the housing 10A comprises two side frames 11A and a retention frame12A extended between the side frames 11A to retain a distance betweenthe side frames 11A and to form a I-shaped configuration. Accordingly,the distance between the side frames 11A should be retained tocorrespondingly match with the length of the fluorescent lamp 20.

In particular, numbers of the housings 10A are selectively assembled toform the expandable light frame in order to hold a predetermine numberof the fluorescent lamps 20. On the other hand, the housings 10A can bedisassembled for minimizing a storage space thereof.

Accordingly, the retention frame 12A is extended between the two sideframes 11A to form the I-shaped configuration to define two lightportions divided by the retention frame 12A. In other words, theretention frame 12A is formed between the two light portions.Preferably, two of the fluorescent lamps 20 are coupled at each of thelight portions such that four of the fluorescent lamps 20 are coupled bythe housing 10A. When two housings 10A are detachably coupled with eachother to form the expandable light frame, the expandable light frame canretain eight fluorescent lamps 20.

The lamp holders 30 are spacedly provided along the inner sides of theside frames 11A in such a manner that two ends of each of thefluorescent lamp 20 are electrically coupled at two corresponding lampholder 30 at the side frames 11A respectively. Accordingly, the lampholders 30 are a plurality of lamp sockets spacedly formed at the sideframe 11A to electrically couple with the ends of the fluorescent lamps20.

When the reflectors 40 and the fluorescent lamps 20 are detached fromthe housing 10A, the housings 10A are adapted to detach from each otherto form a compact structure, such that the reflectors 40, thefluorescent lamps 20, the lamp connectors 50, and the housing 10A can bepacked in a compact package for transportation purpose.

As shown in FIGS. 13 to 15, the housings 10A are detachably coupled witheach other via a frame connector 13A, wherein the frame connector 13Ahas two locking ends engaging with two side frames 11A of the twoadjacent housings via a locking element 14A. The frame connector 13A hasan elongated hollow structure to form two hollow locking ends.

The locking end of the frame connector 13A has a cross sectioncorresponding to a cross section of the side frame 11A. Preferably, theframe connector 13A has a L-shaped cross section defining a top wallbiasing against the top side of the side frame 11 and a rear wallbiasing against the rear side of the side frame 11A. An end portion ofthe side frame 11A fits into the locking end of the frame connector 13Ain order to detachably couple two of the housings 10A with each other.In other words, the end portion of the side frame 11A is slidablycoupled the respective locking end of the frame connector 13A.Accordingly, two locking holes are formed at the end portion of the sideframe 11A and the locking end of the frame connector 13A, wherein whenthe end portion of the side frame 11A is slidably coupled the respectivelocking end of the frame connector 13A, the two locking holes arealigned with each other, such that the locking element, such as a screw,is extended through the two locking holes to lock up the side frame 11Awith the frame connector 13A. In other words, the frame connector 13A isused for connecting the two side frames 11A of the housings 10Aend-to-end. Therefore, the side frames 11A of the housings 10A arealigned to form two elongated transverse side bars extended parallelly,wherein the retention frames 12A of the housings 10A are parallelyextended with each other and are spacedly extended between the elongatedtransverse side bars to form the expandable light frame. It is worthmentioning that two or more locking holes can be spacedly formed at theend portion of the side frame 11A, such that the locking end of theframe connector 13A can be selectively aligned with one of the lockingholes at the end portion of the side frame 11A in order to selectivelyadjust the distance between two adjacent side frames 11A via the frameconnector 13A. It should be appreciated that the frame connector 13A canbe configured to have a U-shaped cross section such that the end portionof the side frame 11A is slidably inserted into the respective lockingend of the frame connector 13A.

As shown in FIGS. 13 to 15, the two alternative modes of the housings10A can be incorporated with each other. Each of the side frames 11Acomprises two arms 111A, as two folding arms, pivotally coupling withthe retention frame 12A, wherein the arms 111A of each of the sideframes 11A are pivotally folded between the unfolded position and foldedposition. At the unfolded position of each of the side frames 11A, thetwo corresponding arms 111A are pivotally folded end-to-end to form anelongated structure. At the folded position of each of the side frames11A, the two corresponding arms 111A are pivotally folded to overlapwith the retention frame 12A such that the two arms 111A are parallelwith each other. Preferably, the two arms 111A of each of the side frame11A have the same length such that each of the side frames 11A can bepivotally folded in half to the retention frame 12A when the side frame11A is pivotally folded at its folded position.

The arms 111A of the side frames 11A are pivotally coupled at the topside of the mid-portion 121A of the retention frame 12A such that wheneach of the arms 111A is pivotally folded towards the retention frame12A, the arm 111A is folded to align with the respective side-portion122A of the retention frame 12A. Therefore, the lamp holders 30 areenclosed and protected within the two corresponding arms 111A of theside frame 11A when the arms 111A are folded at the folded position.

When the housing 10A is pivotally folded at its unfolded position, thefluorescent lamps 20 are spacedly mounted between the side frames 11A toelectrically couple with the lamp holders 30, wherein the reflectors 40are detachably coupled with the fluorescent lamps 20 via the lampconnectors 50 at a position that each of the reflectors 40 is adapted toselectively rotate with respect to an axis of the respective fluorescentlamp 20 for reflecting light from the fluorescent lamp 20 so as tochange a light pattern and/or a light direction of the fluorescent lamp20 towards an opening of the housing 10A. In addition, the reflector 40can be coupled with the fluorescent lamp 20 via the lamp connector 50 orcan be directly coupled to the side frame 11A at a position between thearms 111A of the two side frames 11A. In other words, the housing 10Acan also be incorporated with the conventional reflector 5.

One skilled in the art will understand that the embodiment of thepresent invention as shown in the drawings and described above isexemplary only and not intended to be limiting.

It will thus be seen that the objects of the present invention have beenfully and effectively accomplished. It embodiments have been shown anddescribed for the purposes of illustrating the functional and structuralprinciples of the present invention and is subject to change withoutdeparture from such principles. Therefore, this invention includes allmodifications encompassed within the spirit and scope of the followingclaims.

1. A lighting fixture, comprising: a plurality of housings, each of said housings comprising two side frames and a retention frame provided between said two side frames, wherein said side frame of one of said housings is detachably coupled with said side frame of another said housing; a plurality of fluorescent lamps longitudinally and operatively supported at said housing, wherein said fluorescent lamps are spacedly coupled between said side frames of each of said housings in such a manner that numbers of said housings are selectively assembled to form an expandable light frame in order to hold a predetermine number of said fluorescent lamps while said housings are disassembled for minimizing a storage space thereof.
 2. The lighting fixture, as recited in claim 1, further comprising a plurality of reflectors detachably coupled with said fluorescent lamps respectively for reflecting light from said fluorescent lamps towards an opening of said collapsible housing.
 3. The light fixture, as recited in claim 2, wherein said reflectors are detachably coupled with said fluorescent lamps via a plurality of lamp connectors respectively, wherein each of said reflectors is adapted to selectively rotate with respect to an axis of said respective fluorescent lamp for reflecting light from said fluorescent lamp.
 4. The lighting fixture, as recited in claim 1, wherein said retention frame is extended between said two side frames to retain a distance between said side frames, wherein said side frames of said housing are detachably coupled with said side frames of another said housing end-to-end such that said retention frames of said housings are parallel with each other when said housings are detachably coupled together.
 5. The lighting fixture, as recited in claim 3, wherein said retention frame is extended between said two side frames to retain a distance between said side frames, wherein said side frames of said housing are detachably coupled with said side frames of another said housing end-to-end such that said retention frames of said housings are parallel with each other when said housings are detachably coupled together.
 6. The lighting fixture, as recited in claim 4, wherein said housings are detachably coupled with each other via a frame connector, wherein said frame connector has two locking ends engaging with two side frames of said two adjacent housings via a locking element.
 7. The lighting fixture, as recited in claim 5, wherein said housings are detachably coupled with each other via a frame connector, wherein said frame connector has two locking ends engaging with two side frames of said two adjacent housings via a locking element.
 8. The light fixture, as recited in claim 6, wherein each of said side frames comprises two folding arms pivotally coupled with said retention frame, wherein said folding arms of each of said side frames are pivotally folded between an unfolded position and a folded position, wherein at said unfolded position, said two corresponding folding arms are pivotally folded end-to-end to form an elongated structure, and at said folded position, said two corresponding folding arms are pivotally folded to overlap with said retention frame such that said two folding arms are parallel with each other.
 9. The light fixture, as recited in claim 7, wherein each of said side frames comprises two folding arms pivotally coupled with said retention frame, wherein said folding arms of each of said side frames are pivotally folded between an unfolded position and a folded position, wherein at said unfolded position, said two corresponding folding arms are pivotally folded end-to-end to form an elongated structure, and at said folded position, said two corresponding folding arms are pivotally folded to overlap with said retention frame such that said two folding arms are parallel with each other.
 10. The lighting fixture, as recited in claim 1, further comprising a plurality of lamp holders spacedly provided along inner sides of said side frames, wherein two ends of each of said fluorescent lamps are electrically coupled at said two corresponding lamp holder at said side frames respectively.
 11. The lighting fixture, as recited in claim 6, further comprising a plurality of lamp holders spacedly provided along inner sides of said side frames, wherein two ends of each of said fluorescent lamps are electrically coupled at said two corresponding lamp holder at said side frames respectively.
 12. The lighting fixture, as recited in claim 9, further comprising a plurality of lamp holders spacedly provided along inner sides of said side frames, wherein two ends of each of said fluorescent lamps are electrically coupled at said two corresponding lamp holder at said side frames respectively.
 13. The lighting fixture, as recited in claim 1, wherein said retention frame is extended between said two side frames to form a I-shaped configuration to define two light portions divided by said retention frame, wherein two of said fluorescent lamps are coupled at each of said light portions such that four of said fluorescent lamps are coupled by said housing.
 14. The lighting fixture, as recited in claim 3, wherein said retention frame is extended between said two side frames to form a I-shaped configuration to define two light portions divided by said retention frame, wherein two of said fluorescent lamps are coupled at each of said light portions such that four of said fluorescent lamps are coupled by said housing.
 15. The lighting fixture, as recited in claim 13, wherein said housings are detachably coupled with each other via a frame connector, wherein said frame connector has two locking ends engaging with two side frames of said two adjacent housings via a locking element.
 16. The lighting fixture, as recited in claim 14, wherein said housings are detachably coupled with each other via a frame connector, wherein said frame connector has two locking ends engaging with two side frames of said two adjacent housings via a locking element.
 17. The lighting fixture, as recited in claim 15, wherein said locking end of said frame connector has a cross section corresponding to a cross section of said side frame such that an end portion of said side frame fits into said locking end of said frame connector in order to detachably couple two of said housings with each other.
 18. The lighting fixture, as recited in claim 16, wherein said locking end of said frame connector has a cross section corresponding to a cross section of said side frame such that an end portion of said side frame fits into said locking end of said frame connector in order to detachably couple two of said housings with each other.
 19. The lighting fixture, as recited in claim 17, further comprising a plurality of lamp holders spacedly provided along inner sides of said side frames, wherein two ends of each of said fluorescent lamps are electrically coupled at said two corresponding lamp holder at said side frames respectively.
 20. The lighting fixture, as recited in claim 18, further comprising a plurality of lamp holders spacedly provided along inner sides of said side frames, wherein two ends of each of said fluorescent lamps are electrically coupled at said two corresponding lamp holder at said side frames respectively. 